单项选择题

David ______ his company's success to the unity of all the staff and their persevering hard work.

A．attributed
B．contributed
C．acknowledged
D．pledged
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单项选择题
Economic theory would predict that a fall in the price of a commodity would lead to an increase in ______.
A．assumption
B．resumption
C．consumption
D．presumption
单项选择题
If prisoners behave well they are allowed the ______ of visiting their families at the weekend.
A．equality
B．security
C．privilege
D．prestige
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